Circuit connecter



Dec. 15,1925. 1,565,313

HHA. DOUGLAS CIRCUIT CONNECTEH Filed Oct. 6, 1921 Patented Bee. 15, 1925.

UNETED STATES HARRY A. DOUGLAS, OF BRQNSON, MICHIGAN.

CIRCUIT con a ners-n.

Application filed October 6, 1921.

To all whom it may concern:

Be it known that I, HARRY A. DOUGLAS, citizen of the United States, residing at Bronson, in the county of Branch and State of Michigan, have invented a certain new and useful Improvement in Circuit Connecters, of which the following is a full, clcar,.concise, and exact description.

My invention relates to electrical connecters of the kind employing cylindrical shells that are formed with bayonet channels for the assembly therewith of incandescent lamps or other circuit continuing devices and which carry current continuing means that are coupled with such lamps in mechanical and electrical relation by means of the shells whereby current is furnished to the lamps.

(These shells are mounted upon dash boards or other mountings and are clamped in place by clamping nuts that are in threaded engagement with the shells. Where the mounting boards are so thin that the bayonet channels extend upon the sides thereof where the clamping nuts are disposed such channels and the bayonet pins that are therein prevent the use of ordinary nuts or so interfere therewith as to prevent the proper assembly of the parts.

A connector made in accordance with my invention has the cylindrical shell thereof formed with a flange at one end where the bayonet channel or channels are disposed, this flange engaging one side of the mounting through which the shell is passed. A washer surrounds the shell and is bodily movable along the same, this washer having a cylindrical skirt portion that surrounds the bayonet channel, the internal diameter of this skirt portion of the washer being preferably larger than the external diameter of the shell so as to accommodate the bayonet channels that are surrounded by the skirt portion of the washer together with the pins contained in said bayonet channels. The inner end of this washer is in engage ment with the other side of the mounting while the outer end of the washer is preferably formed with an end wall having a circular opening therein whose diameter is less than the inner diameter of the cylindrical portion of the washer to constitute a seat against which a clamping nut that is in threaded engagement with the shell may be turned to clamp the mounting between the washer and the flange upon the shell.

Serial No. 505,728.

I will explain my invention more fully by reference to the accompanying drawing showing the preferred embodiment thereof and in which Fig. 1 is a view in elevation of a connector for including an incandescent lamp in circuit, the mounting being shown in section; Fig. 2 is a View simi lar to Fig. 1 with all except the lamp shown in longitudinal section; and Fig. 3 illustrates the shell, the washer and the clamping nut in separated relation.

Like parts are indicated by similar characters of reference throughout the different figures.

The cylindrical shell 1 has a flange 2 formed upon the front end thereof, this flange being preferably curled or dished so as to limit the area of its contact with the mounting board 3 and to insure a firm and continuous fitting engagement of the flange with such mounting board. Bayonet slots or other bayonet channels 4 are formed in the front end of the shell contiguous to the flange 2, these bayonet channels extending throughthe flangeso that they may receive the bayonet pins 5 upon the base 6 of an incandescent lamp or other circuit continuing device that is to be assembled with the shell. In automobile practice the mounting boards 3 are now commonly so thin that the bayonet channels 4 project beyond the other side thereof opposite the side that is engaged by the flange 2. The bayonet pins commonly project beyond the outer cylindrical surface of the shell 1 and interfere with the use of an ordinary clamping nut employed to clamp the mounting board 3 between the flange and nut.

In accordance with my invention there is employed a cup-shaped washer having a cylindrical skirt portion 7 whose internal diameter is larger than the external diameter of the shell to afford a space between the skirt and shell which is ample to enclose and clear the bayonet pins. The skirt of the washer is sufiiciently long to prevent the bayonet pinsfrom being upon the rear of the washer irrespective of the thinness of the mounting. The rear end of the washer is formed with an end wall that has a circa lar opening therein that is less in diameter than the inner diameter of the cylindrical skirt to form a seat for the clamping nut 8 that is in threaded engagement with the eX- terior of the shell. The washer not only serves the purpose stated but also has unchanging engagement with the mounting so that the turning of the clamping nut will not mar the finish of the mounting board.

While I have herein shown and particularly described the preferred embodiment of my invention I donot wish to be limited to the precise details of construction shown as changes may readily be made without departing from the spirit of my invention, but having thus described my invention I claim as new and desire to secure by Letters Pat ent the following 1. The combination with a cylindrical shell having a flange at oneend and formed with a bayonet channel adjacent said flange; of a mounting through which said shell is extendedand having one side engaged by said flange; a washer surrounding the shell and bodily movable along the same, said washer having a cylindrical skirt portion that surrounds said bayonet channel and whose internal diameter is larger than the external diameter of said shell and whose inner end is in engagement with the other side of said mounting, the other end. of said washer being formed with an end wall having a circular opening therein whose dia1ne ter is less than the inner diameter of the cylindrical portion of the washer; and a nut in threaded engagement with said shell and bearing against said end wall of the washer to clamp the mounting between the washer and the flange upon the shell.

2. The combination with a cylindrical shell having a flange at one end and formed with a bayonet channel adjacent said flange; of a mounting through which said shell is extended and having one side engaged by said flange; a washer surrounding the shell and bodily movable along the same, said washer having a skirt portion that surrounds said bayonet channel and whose interior is larger than the exterior of said shell and whose inner end is inengagement with the other side of said mounting, the other end of said washer being formed with an end wall having an opening therein through which the shell is passed; and a nut in threaded engagement with said shell and bearing against said end wall of the washer to clamp the mounting between the washcr and the flange upon the shell.

3. The combination with a cylindrical shell having a flange at one end and formed with a bayonet channel adjacent said flange; of a mounting through which said shell is extended and having one side engaged by said flange; a washer surrounding the shell and bodily movable along the same, said. washer having a skirt portion that surrounds said bayonet channel and whose inner end is in engagement with the other side of said mounting, said washer having an opening through which the shell is passed; and a nut in threaded engagement with said shell and bearing against the other end of the washer to clamp the mounting between the washer and the flange upon the shell.

In witness whereof, I hereunto subscribe my name this 3rd day of October A. 1)., 1921.

HARRY A. DOUGLAS. 

